opensource-training.org - dns.ninja
opensource-training.org
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| A | 91.213.36.9🇩🇪 OST-SPE91.213.36.0/24 OpenSource Training Ralf Spenneberg | ||||||
| NS | ns3.nohup.info ⭐ | ||||||
| A | 91.213.36.32🇩🇪 OST-SPE91.213.36.0/24 OpenSource Training Ralf Spenneberg | ||||||
| PTR | ns3.nohup.info | ||||||
| NS | ns1.nohup.info | ||||||
| A | 91.213.36.8🇩🇪 OST-SPE91.213.36.0/24 OpenSource Training Ralf Spenneberg | ||||||
| NS | ns2.nohup.info | ||||||
| A | 91.213.36.50🇩🇪 OST-SPE91.213.36.0/24 OpenSource Training Ralf Spenneberg | ||||||
| PTR | ns2.nohup.info | ||||||
| NS | ns5.nohup.info | ||||||
| A | 85.214.194.4🇩🇪 STRATO85.214.0.0/15 AG | ||||||
| PTR | h3004703.stratoserver.net | ||||||
| MX | xchg.spenneberg.net ⭐ | ||||||
| A | 2001:67c:24:0:d845:ccff:fe0d:cd55🇩🇪 OST-SPE2001:67c:24::/48 OpenSource Training Ralf Spenneberg | ||||||
| A | 91.213.36.228🇩🇪 OST-SPE91.213.36.0/24 OpenSource Training Ralf Spenneberg | ||||||
| PTR | xchg3.spenneberg.net | ||||||
| TXT | v=spf1 +mx ~all | ||||||
| SOA | ns3.nohup.infodns@nohup.info 2026-07-23 #0 | ||||||
org
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a0.org.afilias-nst.info ⭐ ⚠️ Not in parent delegation | ||||||
| NS | a2.org.afilias-nst.info ⚠️ Not in parent delegation | ||||||
| NS | b0.org.afilias-nst.org | ||||||
| NS | b2.org.afilias-nst.org | ||||||
| NS | c0.org.afilias-nst.info ⚠️ Not in parent delegation | ||||||
| NS | d0.org.afilias-nst.org | ||||||
| SOA | a0.org.afilias-nst.infohostmaster@donuts.email serial=1785051779 | ||||||
Same first word
opensource-training.net |
opensource-training.org |
opensource-training.de |
opensource-training.com |
DNS History
13 records (6 active, 7 former)
○NSns0.spenneberg.net2015-05-27 → 2020-01-21 · 6 obs
● 2016-01-14 23:07:28
○ 2016-06-17 23:46:38
● 2020-01-21 13:34:50
○ 2026-02-14 23:36:00
○ 2026-07-26 08:12:52
●NSns1.nohup.info2026-02-14 → 2026-07-26 · 3 obs
● 2026-02-14 23:36:00
● 2026-07-26 08:12:52
○NSns1.spenneberg.net2020-01-21 → 2020-01-21 · 4 obs
● 2020-01-21 13:34:50
○ 2026-02-14 23:36:00
○ 2026-07-26 08:12:52
●NSns2.nohup.info2026-02-14 → 2026-07-26 · 3 obs
● 2026-02-14 23:36:00
● 2026-07-26 08:12:52
○NSns2.spenneberg.net2020-01-21 → 2020-01-21 · 4 obs
● 2020-01-21 13:34:50
○ 2026-02-14 23:36:00
○ 2026-07-26 08:12:52
●NSns3.nohup.info2026-02-14 → 2026-07-26 · 3 obs
● 2026-02-14 23:36:00
● 2026-07-26 08:12:52
○NSns3.spenneberg.net2015-05-27 → 2020-01-21 · 4 obs
● 2020-01-21 13:34:50
○ 2026-02-14 23:36:00
○ 2026-07-26 08:12:52
○NSns4.nohup.info2016-06-17 → 2020-01-21 · 5 obs
● 2016-06-17 23:46:38
● 2020-01-21 13:34:50
○ 2026-02-14 23:36:00
○ 2026-07-26 08:12:52
●NSns5.nohup.info2026-02-14 → 2026-07-26 · 3 obs
● 2026-02-14 23:36:00
● 2026-07-26 08:12:52
○MXmx.spenneberg.net2015-05-27 → 2016-06-17 · 4 obs
● 2016-06-17 23:46:38
○ 2017-02-20 12:39:44
○ 2026-07-26 08:12:52
●MXxchg.spenneberg.net2017-02-20 → 2026-07-26 · 3 obs
● 2017-02-20 12:39:44
● 2026-07-26 08:12:52
○A91.213.36.112015-05-27 → 2017-02-20 · 4 obs
● 2017-02-20 12:39:44
○ 2020-01-21 13:34:50
○ 2026-07-26 08:12:52
●A91.213.36.92020-01-21 → 2026-07-26 · 3 obs
● 2020-01-21 13:34:50
● 2026-07-26 08:12:52
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| org | b0.org.afilias-nst.org, b2.org.afilias-nst.org, d0.org.afilias-nst.org | - |
| opensource-training.org | ns1.nohup.info, ns3.nohup.info, ns2.nohup.info, ns5.nohup.info | - |
✅ Authoritative Response
Server:85.214.194.4
NS records: ns1.nohup.info, ns3.nohup.info, ns2.nohup.info, ns5.nohup.info
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 4041ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 91.213.36.9 |
| NS | 4 | ns5.nohup.info, ns1.nohup.info... |
| MX | 1 | xchg.spenneberg.net (pri: 5) |
| TXT | 1 | v=spf1 +mx ~all |
| SOA | 1 | ns3.nohup.info dns.nohup.info |
Analysis
IP Addresses
opensource-training.org resolves to just one IP address, 91.213.36.9.
Two other host names, along with diealtepost.de, opensource-security.de and bridgewall.com, also share IP numbers with opensource-training.org.
Name Servers
The NS records for opensource-training.org point to four name servers: ns1.nohup.info, ns2.nohup.info, ns3.nohup.info and ns5.nohup.info.
There is at least partial name server overlap between opensource-training.org and other domains — os-t.de, bsd-training.de, wes-t.de and two more among them.
These name servers frequently co-occur with the name servers ns4.nohup.info and ns0.nohup.info.
The hosts ns1.nohup.info, ns2.nohup.info, ns3.nohup.info and ns5.nohup.info all resolve to exactly one IP address each: 91.213.36.8, 91.213.36.50, 91.213.36.32 and 85.214.194.4 respectively.
Mail Servers
The sole mail server for opensource-training.org is xchg.spenneberg.net.
Among the domains sharing a mail server setup with opensource-training.org are sue-d.de, ostd.de, diealtepost.de and two others.
xchg.spenneberg.net carries two IP numbers: 91.213.36.228 and 2001:67c:24:0:d845:ccff:fe0d:cd55.